Who Isytherine is may not be clear from the story, but Lin is actually Celinese in the game, an alternate version of Celinese who appears on the day of Ither's reboot. With her outstanding talent and unique charm, she holds a pivotal position at Hydra Bank, being one of the famous top ten managers, and is a very capable female character with relatively high usage rates.

In the ranking of these top ten managers, Celinese ranks tenth. Despite being at the bottom, she is the youngest among them. Celinese possesses a very powerful basic attack skill, Thousand Seeker Rain. When she uses this skill, it can deal 240% damage to a single enemy, and there is also a 40% chance to randomly add 2 debuffs from 1 turn of continuous damage, silence, and forgetfulness, making the enemy suffer from various negative statuses while taking damage. This basic attack skill already has such power at level 2.
As Celinese continues to grow and unlock her potential, she gains different potential and skill upgrades at various levels. In terms of potential upgrades, her attack power gradually increases, starting with +25 attack, then +40 attack, followed by +5% attack, and then +60 attack and another +5% attack. At level 3, there is a significant boost of +100 attack. At level 4, the focus shifts to speed, increasing her speed by 5 points, allowing her to act faster in battle. At level 5, her speed is further increased by 10 points, enhancing her mobility in combat.

In terms of skill upgrades, the damage coefficient of the basic attack keeps increasing, from the initial 240% to 220%, then 240%. The probability of random debuff effects also changes, first increasing to 40%, and then adjusting differently at various levels. Besides the basic attack, Celinese has a unique Rain Curtain skill. At the end of her turn, she grants all allies a Rain Curtain equivalent to 12% of her maximum HP, which lasts until the start of her next turn.
The Rain Curtain effect is very powerful, as it absorbs 40% of the damage and reflects 75% of the absorbed damage. During its duration, effect resistance is also increased by 30%. At different levels, the Rain Curtain skill also receives corresponding potential and skill upgrades. For example, at level 2, defense is increased to varying degrees, including +15 defense, +25 defense, +5% defense, +40 defense, and another +5% defense. In terms of skill upgrades, the absorption rate of the Rain Curtain increases to 35%.

At level 3, defense is further increased by 70 points, and the absorption cap of the Rain Curtain increases to 12% of her maximum HP. At level 4, effect hit rate increases by 8%, and the absorption rate of the Rain Curtain increases to 40%. At level 5, the effect hit rate increases again to 12%, and the reflection damage rate of the Rain Curtain increases to 75%. Celinese's ultimate skill, Weeping Rain Vortex, is equally impressive. This ultimate skill has a cooldown of 4 turns, and when used, it deals 4 segments of 75% damage to all enemies, with each attack having a 30% chance to apply 2 turns of attack reduction and critical rate reduction.
This makes the enemy not only suffer from high damage but also fall into a situation where their attack and critical rate are reduced, weakening their offensive capabilities. In terms of potential upgrades for Weeping Rain Vortex, her HP starts with +250, then +400, followed by +5% HP, +600 HP, and another +5% HP, continuously enhancing her vitality. At level 3, her HP increases by 1000 points. At level 4, her HP increases by another 5%, further enhancing her durability. At level 5, her HP is increased by 10%, and the skill cooldown is reduced by 1 turn.

This is the introduction to who Isytherine is. This female character has been mentioned briefly in the strength rankings before, and her abilities are widely recognized. She also has enough potential to be further enhanced through leveling up later on.